Brake.



No. 710,640. Patented Dot. 7, |902.

S. T. WELLMAN J. MGGEORGE.

BRAKE.

i ,(Appximion med July 15, 1901.) (No Model.) 2 Sheets-Sheet l.

THE Non-ms PETERS QQ. Pncfourm.. wAsmNcmN. n. c.

N0. 710,640. Patented v012i. 7, |902.

S. T. WELLMAN &. J. MGGEORGE.

BRAKE.

(Application filed July' 15, 1901.)

(No Model.) 2 Sheets-$heet 2.

@wmmw y w fyjs l l r i I O Uivrrnn STATES hPattern OFFICE.

SAMUEL T. IVELLMAN AND .IOIAIN'h/IOGEORGE, OF CLEVELAND, OHIO,l ASSIGNORS TO VELLMAN-SEAVER ENGINEERING COMPANY, OF CLEVELAND, OHIO, A CORPORATIONIMT OHIO.

BRAKE.

SPECIFICATION forming part of Letters Patent No. 710,640, dated October 1902.

Application led fl'ulyT 15, 1901. Serial No. 68,444. (No model.)

To @ZZ whom t may concern:

Be it known that we, SAMUEL T. WELLMAN and JOHN MCGEORGE, citizens of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented or discovered new and useful Improvements in Brakes, of which the following is a speciiication.

1n the accompanying drawings, which make part of this specification, Figure 1 is a side elevation, partly in section, of our improved braking mechanism. Fig. 2 is a top plan view of the same.

Our invention relates to improvements in baud-brakes of the kind employed in connection with the cable-drums of hoisting-engines for elevators, mines, the., and belongs to the class that utilizes the weight of the load to effect the braking action. In hoisting-machines of this class the brake is a most important if not indispensable feature, for the reason that it not only forms the safeguard against dropping of the load on the drum in the event of accident to the engine or motor, but is relied upon, to a large extent at least, to control the speed of descent and the stoppage of the load in the operation of the machine.

`We will now describe our invention so that others skilled in the art may manufacture and use the same, reference being had to the accompanying drawings, forming part of this specification.

Like symbols of reference indicate like parts.

In the drawings the drum 2 has its ends supported on a suitable stationary frame, of which the horizontal parts Sare shown. The load is supported on a cable (not shown) wound in the ordinary manner in the grooves shown in that part of the drum between its bearings a and a'. One end of the drum is journaled in the fixed bearing 4, supported on one of the horizontal parts 8 of the frame, while the other end 3 is journaled in the bearing e, supported indirectly on the other one of the horizontal parts 8 of the frame. The bearing a is supported at the point 6 on a lever 5, which has its fulcrum on a projection 7, extending from the side of the adjacent part 8 of the frame. To one extremity of the lever 5 is pivotally connected one end of an auxiliary lever 9, the other end of the auxiliary lever being connected to one end of a brake-band 10. The brake-band 10 extends from its point of connection with the lever 9 around the brake-drum 11 and at its other end is connected with the frame 8 at the point 12.

13 is an electromagnet for releasing the brake-band from the brake-drum when the machine is employed for hoisting, said releasing operation being performed through the medium of the armature 14, pivotally connected at the point 15 with the lever 5.

16 is the motor, preferably an electric motor;l17, the motor-shaft, on which is mounted a gear-wheel 18, meshing into a gear-Wheel 19 on the brake-drum shaft 20. At the other end of the shaft 2O is a gear-Wheel 2l, meshing into a gear-wheel 22, mounted on the shaft 3 of the hoisting-drum 2.

Y'The lengths of the arms of the lever 5 on each side of its pivotal point 7 are so proportioned one with the other by means of the set-screw 24 24 that the retarding action of the load on the brake-drum 11 exerted through the medium of the pivot 6, the levers 5 and 9, and the brake-bars 10 in lowering is a definite percentage above the amount which is just sufficient to hold the load. This percentage of retarding action is to be overcome by the motor, but only the percentage. Thus it will be apparent that when the motor' is not in operation the brake will be held on by the force exerted by the load itself through the several described instrumentalities on the brake-drum 11 and its shaft 20.

In order to relieve the mechanism of the braking action when the same is used for hoisting, the electromagnet 13 is employed, connection being made therefrom to the controller of the motor, so that when the handle of the controller is placed in position for hoisting electrical connection is made with the magnet, energizing the same and attracting the armature 14 and raising the end of thelever 5 to which said armature is attached. The raising of this end of the lever 5 imparts a corresponding downward movement to the other end of said lever, which through the IOO medium of the auxiliary lever 9 relieves the brake-drum 1l from the brake-band 10.

We claiml. A stationary frame, a rotary and oscillatory load-sustaining element having two bearings supported on the frame, said 'element having its load-sustaining portion between the said bearings, a brake, and mechanism actuated by the oscillation of said element to operate the brake.

2. A stationary frame, a rotary and oscillatory load-sustaining element having two bearings supported on the frame, said element having its load-sustaining portion between the said bearings, a brake, and a lever actuated by the oscillation of said element to operate the brake.

3. Astationary frame, a rotary and oscillatory load-sustaining element thereon, a movable support for a portion only of said element, and a brake actuated by the movement of said support.

4. A stationary frame, arotaryand oscillatory load-sustaining element thereon, a lever-support for a portion only of said element, and a brake operated by the movement of said lever.

5. A load-sustaining element, a brake, and an adjustably-mounted lever connected to said brake, said element having support on said lever.

6. A load-sustaining element, a brake, and an adjustable lever connected to said brake, said element being oscillatory and having pivotal support on said lever.

7. In combination, a load-sustaining device, its axis having a rotary and a vertical movement, a braking mechanism and an adjustably-mounted lever connected to said braking mechanism, said load-sustaining device having a pivotal support on said lever.

S. In combination, a frame, a brake,a lever pivoted on a portion of said frame and connected at one side of its pivot with the brake, a drum having one of its bearings supported bysaid pivoted lever at the other side of said pivot, an electric motor, and an electromagnet adapted to move the free end of said pivoted lever to release the brake when the device is used for hoisting, said electromagnet being energized by the controller of the motor When the same is moved to hoisting position.

9. In a` braking mechanism, a Windingdrum, one end only of said drum vertically movable, a pivotally-supported lever, the vertically-movable end of said drum supported on said lever; whereby a braking mechanism is operated.

l0. In a braking mechanism, a stationary frame, a Winding-drum thereon, one end only of said drum vertically movable, a pivotallysupported lever, a bearing on said lever for the vertically-movable end of said drum, said bearing located at one side of the vertical plane of said levers fulcrum; whereby a braking mechanism is operated.

l1. In a braking mechanism, a Windingdrum, one end of said drum vertically movable, a main lever, a bearing on said lever for the vertically-movable end of said drum, an auxiliary lever secured directly to said main lever, and a braking device secured to the auxiliary lever.

l2. A load-sustaining device, a braking mechanism, a lever connected to said braking mechanism, said load-sustaining device having a pivotal support on said lever, and electrically-operated means for releasing the brake.

Signed at Cleveland this 5th day of July, 1901.

SAMUEL T. VELLMAN. JOHN MCGEORGE.

lV'itn esses:

W. CoMsTocK, HERBERT T. GLIDDEN.

sps 

